Chemistry of Gases and Applications

This is the correct option. Nitrogen is used for making fertiliser needed for agriculture.

It is a nobel gas. Nobel gases experience london dispersion force. The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.

The atmosphere consists of 78% nitrogen. 

Freon is a trade name for a group of chlorofluorocarbons (CFCs) and related compounds used primarily as refrigerants. Neon, Boron, and Krypton are chemical elements.

The earth's atmosphere near the surface is composed primarily of Nitrogen and Oxygen. Together, the two comprise about 99% of the gas in the atmosphere. Percentage of Nitrogen in the atmosphere is about 78.084% which is the maximum amount.

Carbon dioxide is a chemical compound consisting of a single type of molecule (CO2), whereas air, lemonade, and vinegar are mixtures containing multiple types of molecules.

Earth's atmosphere is composed of approximately 78% nitrogen, making it the most abundant gas in the air.

Air is a mixture of gases, primarily nitrogen and oxygen, that surrounds the Earth.

Noble gases are also known as inert gases and do not take part in chemical reactions.

Chlorine gas is  yellowish green in colour  having melting point  -101 ̊ C  and boiling point  -35 ̊ C.

Hydrogen sulphide gas has smell like rotton egg.

Nitrous oxide (N2O) is commonly known as laughing gas due to its euphoric effects when inhaled. It is frequently used in dentistry and surgery for anesthesia.

Gobar gas, or biogas, is produced through the anaerobic digestion of organic matter, primarily cow dung. Its main combustible component is methane.

Ans - 4

The main nitrogenous waste of Hydra is ammonia. Hydra has no organ of excretion, therefore, excretion of waste nitrogenous matter occurs directly by diffusion through cell membrane.